When I had my ears flushed out by a doctor the doctor used a syringe like tool.
The doctor used the syringe like tool with water and a saline mixture which he inserted into my ear with the syringe like tool and that's what flushed the earwax out of my ears.
Like I did you may feel slight discomfort in the ear which is caused by holding the ear or the water in your ear but it should go away soon after.